材料科学
假电容
阳极
超级电容器
锂(药物)
电化学
共沉淀
电容器
功率密度
化学工程
储能
阴极
循环伏安法
电极
纳米技术
电压
化学
功率(物理)
电气工程
物理化学
医学
物理
量子力学
工程类
内分泌学
作者
Zhe Li,Zheng-Hua He,Jing-Feng Hou,Jian‐Fei Gao,Ling‐Bin Kong
标识
DOI:10.1002/ente.202300585
摘要
Exploring better electrochemical energy storage devices is a great challenge. Lithium‐ion capacitors have attracted much attention because they combine the advantages of Li‐ion batteries and supercapacitors, but the mismatch between the kinetics and capacity of the cathode and anode is still an extraordinary gap. In order to address this issue, a cubic‐phase perovskite fluoride KMnF 3 via a simple and safe coprecipitation way is synthesized. The KMnF 3 electrode exhibits a cubic‐phase structure and a pseudocapacitive kinetics by X‐ray diffractometer and cyclic voltammetry. The high specific capacity (189 mAh g −1 at 0.1 A g −1 for 500 cycles) and fast pseudocapacitive control dynamics (at the sweep speed of 0.2 mV s −1 , the pseudocapacitance ratio is 62.12%) can be demonstrated in half cell, while the b ‐value is up to 0.95. Further assembled with activate carbon to form lithium‐ion capacitors (LICs), KMnF 3 //AC delivers high energy density (24 Wh kg −1 ), high power density (3900 kW kg −1 ), and long cycle life over 4000 cycles. The findings shed lights on developing advanced electrode materials for high‐performance electrochemical LICs.
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